1, 3 ~ 4 The objects with obvious differences in length are arranged in the order from long to short and from short to long.

2, willing to boldly describe their own order.

Teaching preparation:

Each child has 3 ~ 4 straws, sorting boards, etc.

Teaching process:

(1) Guide children to review the length, guide children to compare and find out the longest, shortest and longer straws respectively.

(2) Sort by length 1. Encourage children to explore freely: organize three straws.

2. Guide the children to describe the sorting order: from long to short or from short to long.

3. Add another straw to guide the child to reclassify.

Teaching expansion:

1, picture column: put text contact and watercolor pen to guide children to draw the longest, shortest or longer line in a group of lines.

2. Operation group: put pencils, iron wires, wool, paper strips, etc. Guide children to classify various materials according to their length.